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UNITED STATES PATENT OF ICE.

HENRY W. JOHNS, OF BROOKLYN, NEW YORK.

ASBESTUS SHEET FOR ROOFING, 800.

SPECIFICATION forming part of Letters Patent No. 230,946, dated. August10, 1880.

Application filed April 19, 1880. (No model.)

To all whom it may concern:

Be it known that I, HENRY W. JOHNS, of the city of Brooklyn, in thecounty of Kings and State of New York, have invented. a new and usefulImprovement in Asbestus Sheet for Roofing, &c., and Combined AsbestusSheet, of which the following is such full, clear, and exact descriptionas will enable others skilled in the art to which it most nearlyappertains to make and use the same.

My invention consists of a sheet of fibrous asbestus, having on thesurfaces of the sheet a glutinous or cementing material, so as to holdbetween the thus cemented and fastened outside portions of the sheet aloose porous interior, and the combination of this sheet, having ones orboth sides thus cemented, with hair felt or other sheet.

On a sheet orapron is deposited to any desired thickness fibrous orflocked asbestus alone, or mixed with WOOl, cotton, or similar material.I prefer to use the asbestus by itself alone. This is wetted or coatedwith a glutinous liquid sizing, silicate of soda, limewater, or othermaterial which will make the fibers adhere to one another. The sheet maybe now turned over and the other side treated in the same H1& Ill[lel -t6., wetted with glutinous matterwhen it will be found that the outsidesor surfaces of the sheet are firmly united together, and that theycontain within a porous or loose center.

The glutinous matter may be applied to both sides of the sheet at onceby rollers or otherwise. 5

The sheet thus made, when sufficiently dry, is passed betweenpressure-rollers, which will firmly fasten the outer portions of thesheet.

Another portion of my invention consists in attaching theabove-described sheet to another 40' sheet, such as hair felt, canvas,or paper, by means of adhesive or glutinous matter, forming anasbestus-lined sheet or felt, fire-proof, or nearly so.

The exposed surface of asbestus in the com- 5 bined sheet may be sized,as described above, or left in a loose or flocky state, as desired.These sheets may be used with great advantage in all places whereinsulating of any kind is desired, is cheap of manufacture, readilyapplied, and does not deteriorate by exposure to heat.

What I claim as new, and desire to secure by Letters Patent, is-

1. As a new article of manufacture, a flexible sheet, \vaddii-ig, orbatting composed of fibrous asbestus, the outside or surface portions ofwhich are united by a glutinous substance, substantially as specifiedand set forth.

2. As a new article of manufacture, a sheet of fibrous asbestus attachedto hair felt or other sheet, substantially as described.

HENRY W. JOHNS.

Witnesses:

J OHN W. Snu'rn,

WM. N. TOSHAGHT.

